we have two coalescent filters, one before the chiller, one after the chiller, by the time the air goes through the two tanks and get's to the chiller, it's actually cool to the touch, the boge unit actually creates pretty cool air before it's even chilled. It's amazing how much moisture is capture in the two 80 gallon tanks though, so I would always recommend a tank, or two, it never hurts and will allow your unit to run less. Not so much a worry on the unit, but a 20hp 3 phase compressor does use a lot of juice lol. What alot of people don't realize with air compressors is that they actually send some oil/particulate through the lines over time, heated oils become acidic, the coalescent filters capture that and keep the lines clean and in turn keep any of that crap from getting into your gear over time.